/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2025 Apryse Group NV
    Authors: Apryse Software.

    This program is offered under a commercial and under the AGPL license.
    For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.

    AGPL licensing:
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
using System;
using System.Collections.Generic;

namespace iText.Commons.Utils {
    class IdentityComparator<T> : EqualityComparer<T>
    {
        public override bool Equals(T x, T y)
        {
            return GetHashCode(x) == GetHashCode(y) && object.ReferenceEquals(x, y);
        }

        public override int GetHashCode(T obj)
        {
            return Default.GetHashCode(obj);
        }
    }

    public class IdentityDictionary<TKey, TValue> : Dictionary<TKey, TValue>
    {

        public IdentityDictionary() :
            base(new IdentityComparator<TKey>())
        {
        }

        public IdentityDictionary(Int32 capacity) :
            base(capacity, new IdentityComparator<TKey>())
        {
        }

        public IdentityDictionary(IDictionary<TKey, TValue> dictionary) :
            base(dictionary, new IdentityComparator<TKey>())
        {
        }
    }
}
